On bad terms with Dorothy over splitting bills (2,4)
I believe the answer is:
at odds
'on bad terms' is the definition.
(I've seen this before)
'dorothy over splitting bills' is the wordplay.
'dorothy' becomes 'dot' (nickname for someone called Dorothy).
'over' is a reversal indicator.
'splitting' indicates putting letters inside.
'bills' becomes 'ads' (I can't explain this - if you can you should give a lot more credence to this answer).
'dot' in reverse letter order is 'tod'.
'tod' inserted within 'ads' is 'AT ODDS'.
'with' is the link.
Can you help me to learn more?
(Other definitions for at odds that I've seen before include "In conflict with, oppposed to (2,4)" , "Opposed, in conflict with" , "Quarrelling" , "Conflicting (with)" , "On bad terms" .)